參數(shù)資料
型號(hào)： TPS9125PW
廠商： Texas Instruments, Inc.
英文描述： 5 V/3 V SIM SUPPLY AND LEVEL SHIFTERS
中文描述： 5伏/ 3伏SIM卡供應(yīng)及電平轉(zhuǎn)換器
文件頁(yè)數(shù)： 3/24頁(yè)
文件大?。?/td> 338K
代理商： TPS9125PW
TPS9125
5 V/3 V SIMSUPPLY AND LEVEL SHIFTERS
SLVS244A – SEPTEMBER 1999 – REVISED NOVEMBER 1999
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description
voltage generator (charge pump)
The voltage generator can be programmed in two modes:
1.
SIMPWR = 0: SIMVCC is left open, voltage generator disabled.
2.
SIMPWR = 1: Depending on the signal on control terminal MODE, SIMVCC is either programmed to:
a.
MODE = 0: 5 V
±
10% (this is the default condition under which the system powers up),
or
MODE = 1: SIMV
CC
is equal to the supply voltage V
DD
minus a voltage drop of 50 mV maximum.
The setting of the SIMVCC voltage (MODE = 0 or 1) can only be changed when SIMPWR is low. Therefore, as
specified in GSM11.12, supply voltage switching is performed by deactivating the SIM and activating it at the
new supply voltage.
b.
In 5-V mode, a regulated charge pump is used to step-up the 3-V supply rail (min 2.7 V) to the 5-V supply rail.
The voltage generator uses two external capacitors, one pump capacitor connected between VCAP1 and
VCAP2 and one output buffer capacitor connected between SIMVCC and GND. It operates at a nominal
frequency of 800 kHz, and also supplies the integrated level shifters to allow for 5-V compatible logic signals
on SIMRST, SIMCLK, and SIMDATA.
In 3-V mode, the supply voltage V
DD
is connected via an integrated PMOS switch to the SIMVCC output. The
charge pump, oscillator, and voltage reference are disabled in the 3-V mode to reduce power consumption. The
supply voltage of the integrated level shifters is V
DD
minus a voltage drop of 50 mV maximum.
control block
The control block uses the three control signals SIMPWR, MODE, and RESET to set the TSP9125 operation
modes.
When SIMPWR is set low, the TSP9125 goes to power-down mode. To comply with the ISO/IEC 7816-3
specification for deactivation of the SIM contacts, the input terminals RST, DATA, and CLK must be low before
the SIMPWR terminal is allowed to be taken low. When SIMPWR is low, the SIMRST, SIMDATA, and SIMCLK
terminals are kept low and SIMVCC is left open.
The RESET input is used to disable the TSP9125 in case the SIM card is removed from the reader under
operation. The input is therefore typically connected to a mechanical or other device used to detect the removal
of the SIM card. When RESET is taken low, the SIMDATA, SIMCLK, and SIMRST terminals are taken low and
SIMVCC is left open, until RESET is taken high again.
Table 1. Control Block Function Table
RESET
MODE
SIMPWR
OPERATING MODE
0
X
X
SIM supply disabled; SIMVCC open; SIMRST and SIMCLK and SIMDATA low
1
0
0
TSP9125 in power-down mode. SIM supply disabled; SIMVCC open; SIMRST, SIMCLK, and SIMDATA low;
SIMVCC programmed to 5-V mode.
1
1
0
TSP9125 in power-down mode. SIM supply disabled; SIMVCC open; SIMRST, SIMCLK, and SIMDATA low;
SIMVCC programmed to 3-V mode.
1
X
1
TSP9125 in normal operation mode; SIM supply enabled, SIMVCC = 5 V or 3 V depending on how it was
programmed.
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